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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cced923780bfb7bbad24352912e5c39861e543b89325eff0c8092f7e67680837' 
  AND token = 'cQiRfAKCxFTUtiCYkdk2yRuy8u1000SlOvNon06/cWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}